In the hierarchy chart shown below, which of the following is GrandChild2 able to access? 
Definitions:
MHC Incompatibility
A condition where the Major Histocompatibility Complex antigens between two individuals are so different that it can lead to rejection of transplanted tissues or organs.
Immunosuppressive Drugs
Compounds that alleviate or prevent an overactive immune response, crucial in preventing organ transplant rejection and treating certain autoimmune disorders.
Mechanical Barrier
A physical structure that prevents the entry or spread of pathogenic organisms, particles, or substances.
Mucous Membrane
Body membrane that lines the tubes of several organ systems in humans; secretes mucus that helps protect the body from infection.
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